Yep, point taken........ But if you're out there in the wide Bayonet collecting world, the correct screw for the No5, 7 etc etc scabbard mouthpiece is a 6-BA machine head (a sort of semi-rounded appearance and readily available on ebay under model engineering supplies). The brass or steel mouthpiece 6BA thread is easily stripped if you're a bit ham-fisted but you could easily machine out the oversize hole, soft solder a bush in place, re-drill and tap to get you out of a hole. We'd do it if we were pushed or awaiting spares but not as a general rule.

I mentioned in a thread some time ago but in Malaya in the 60's, we had loads of single screw No5 bayonets but the grips were always prone to cracking due to lack of support for the grips when twisted I imagine. We also had loads of grips too but with the one and two hole grips having the same part number, it was always a bit of hit or miss whether you got, say 10 left handed single hole and ten right handed two hole grips.